[SCSI] expose eh_timed_out to the host template

It looks like megaraid_sas at least needs this to throttle its commands
as they begin to time out.  The code keeps the existing transport
template use of eh_timed_out (and allows the transport to override the
host if they both have this callback).

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index b8edcf5b54511be2f10fc9690fd01fbdd4dfb99e..7a1a1bb1341e76f2e267f260a8cd0d47677e3131 100644 (file)
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -184,10 +184,19 @@ int scsi_delete_timer(struct scsi_cmnd *scmd)
  **/
 void scsi_times_out(struct scsi_cmnd *scmd)
 {
+       enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
+
        scsi_log_completion(scmd, TIMEOUT_ERROR);
 
        if (scmd->device->host->transportt->eh_timed_out)
-               switch (scmd->device->host->transportt->eh_timed_out(scmd)) {
+               eh_timed_out = scmd->device->host->transportt->eh_timed_out;
+       else if (scmd->device->host->hostt->eh_timed_out)
+               eh_timed_out = scmd->device->host->hostt->eh_timed_out;
+       else
+               eh_timed_out = NULL;
+
+       if (eh_timed_out)
+               switch (eh_timed_out(scmd)) {
                case EH_HANDLED:
                        __scsi_done(scmd);
                        return;

diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 965b6b8ffec580f20c692048ac89883b0d2faebb..68f461b7a8355401330a42b35f52aba9393e10db 100644 (file)
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -325,6 +325,19 @@ struct scsi_host_template {
         */
        int (*proc_info)(struct Scsi_Host *, char *, char **, off_t, int, int);
 
+       /*
+        * This is an optional routine that allows the transport to become
+        * involved when a scsi io timer fires. The return value tells the
+        * timer routine how to finish the io timeout handling:
+        * EH_HANDLED:          I fixed the error, please complete the command
+        * EH_RESET_TIMER:      I need more time, reset the timer and
+        *                      begin counting again
+        * EH_NOT_HANDLED       Begin normal error recovery
+        *
+        * Status: OPTIONAL
+        */
+       enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
+
        /*
         * suspend support
         */